Re: "It won't"
More detail on single vs twin engine aircraft losses here:
https://defenseissues.net/2014/08/09/single-vs-twin-engined-fighters/
In short there's no clear cut advantage taking them as a whole, although certain single engined aircraft have a worse engine related loss rate than certain twins and vice versa.
Re being hit in one engine, these days it's likely that will cause bits of the damaged engine to enter the other engine at high speed so you're not really any better off. Certainly the article link above gives the F-15 and F-18 higher loss rates in Gulf War 1 than the F-16 despite it only having one engine.
Biting the hand that feeds IT
